Automatic calling device



Oct. 23,1925.

J. G. BLESSING AUTOMATI C CALLING DEVICE original Filed Aug. 22 1921 Il `E g Juhu l--.Blessmg Z .testiseteit @se 13; 1925.y

met STATES 'sexen e. ennssme, or ou: senses contreien, or

al' l unime .sirio emma envios.

Application mail August se, Liefst, serial No. 494,281. Renewed Harsh 20,1825.

To all whom t 'may concern:

Be it lmown thet I, JOHN G, BLnesING, e citizen of the United States of America, end s resident of 'Dek Forest, Cook County, end Stets o'tlllinois, have invented certain new endnseful lm rovements in Automatic Ceiling Devices, o which the following 1s s specicetion.

liiy invention relates to' impulse sending devices of the dial type in which the impulses ere' generated endV transmitted `successively in dente series according to denite digits siter nuxmipulatim of the died. f f' More perticulsrly the inventiony relates to devices of the above type in which the action of the' impulse mechanism of the dial, when influencing the latter, is automatically controlled b e governor, and the impulses are generute by the action of an interrupter, ,commonly sind hereinafter termed the impulse cam, whichlatter as well as its governer, ere drivenv from the dial b means of sppropriate geen* transmission. thesedevices, endperticulerlywhen asin the present instance, they ereA constructed in the :torna oecellingdevice for automatic telephone systems, mamy edorts have been made sind various means have been devised to pro'- the interval between the transmission oi? the last impulse of one series and thatot the tiret impulse oit the next succeeding series, with a View of lengthening the time within which the eutomatic switches of the system' ere expected eiiciently to performv sind complete their function 'as predetermined by the individual'impulseseries.A

f 'illhev object .of lthis invention is to provide a. more simplified lmethod of accomplishing the shove results,-thus making-the. device more desireble from an economical and commercinl viewpoint. v

Another feature is the "improved means ior stopping vthe dial upon its return to nornml.V l 1 The above important features ofthe in"- ventionand .other detnils-.will now be more' vtelly describedvhy reference to the practical embodiment illustrated by wa. of example in the annexed drawings .in w Vich:A

Figure 1 is a front view of the device showin the power spring exposed 'by the remova of the cover plate shown in Figure Figure 2 is ay rear view of the device show-v;

ing the centrifugal governor and the impulse generating ca v 'Figure 3 shows more orlessdiagrammatically the whole of the gear beneath the finger hold .dial as it appears when viewed in the'direction of the arrows IIIe-III shown in Figure 4.

Figure 4 is an axial section of the wholeldevice takenl on the line I`VIV of the Figy ure 3 and viewed in the direction of the arrows indicated therein. c Figure 5 illustrates more clearly the parte of the mechanism for displacin the shaft dial inthe normal position of the parts.

. Figure 6 shows mja similar figure the same' mechanism when 'the dial is'in of- Toip'revent the finger holdv dial from sli ping oi the stem 3a. vit `is rotatably rhe d `therein by a y screw. is provided-with a lateral lug 4 to vscrew/1. The hen-d of this receive one .end of azsspiral power 5, the otherend of notchor to aslug of ev cup 6, forming artof or externally secured tothe finger vho d dial andservin `as e protectinv casing for that sprin he'ingerhold diujl is, asv-usual, provi ed lwith ten or eny'oth'er requisite numberof finger holds which register with Spring which is secured in a* (lli "of the `impulse cam and thev stop ook for the device comprises the usual thefnumeralsfor.'letters' on the usual; 4

dial so as to indicating disc llisnitably secured `beneath the dialJ Loosely fitted on the` hub of the dial is a compound gear comprising a ratchet wheel 1li and a gear 30 having a common hub. Secured to the upper side of the-finger hold reject down into the ath of a ratchet pawl 7 in uenced by a s ring 8. Secured to the under side o?? the linger hold dial close to its eriphery is a pin '9 which, at the end of t e return increment of the dial Il is adapted to stop screw 12 projecting into its path .trom the :indiening lug 1G o the usual fixed linger step 11, thereby preventing the dial from the teeth 1ais having moved back-ward beyondits normal position. Ilhis stopping arrangement is not necessary but is desirable when making certain adjustments, the important stopping associated with the gear 26 and the oase 3 will hereinafter be explained. The' spring S normally1 tends to hold the pawl 7 in engagement with the teeth of ratchet Wheel la so that'asthe dial is r0- tated forward in the direction-of the arrow fi. Fig, 1 (for setting) the pawl 7 rides over the ratchet wheel 14, and upon the release and return movement of the l engages said teeth to canse the ratchet wheel lto be rotated with the dial.

The cover plate shounin Fig. 7 is shaped nt crei the cup (i and may be secured to the dial in any known manner.

The shallow housing 3 is provided rear- With a cup shaped circular liange (Figs. el and 5) forming' a circular cavity 'l accommodation of the centrifugal provided with. a thickened the impulse 15 for t governor 21 and portion 151l for the mounting of springs 16 and 17, and ojl the 18 and 19 and with a thickened portion 15b joni'nelled in which is the shaft of the im-l pulse g# nieratinp,` or interrupter cani 20,'and other related thereto.

The springs 16 yand `17 are repeatedly in the operation of the device by the Wherebj7 impulses are generated whi'e 4the springs 18 and 15)v are closed as the dial 1 moves oflnornuilv to shunt the talking equipment of the telephone during impulses. in' the example shown vthe impulsesprings 16 und 17 and vthe shunt springs 18 and 19 are arranged directly :there one another and the top spring 19 is lcngthen'ed so that normally the Afree end ot the shaft of the can/1.20 is in contact With the-cud of the spring 19 holding ythe latter under tension.

rihe cuni 200i the insulating` material is, as shown, semi-circular vin form so as to break the contact between the interruptor is oi great advantage,

springonly once in every revolution, which .inasmuch as it detinitely safeguards thegenerntion of uni-` :torni individual impulses. I

dial, the 'pawl therefore constitute shunt springs mumbai i `As will more clearly be seen from Figures 4, and 6 this cam is mounted ony a short stub shaft` 27 rotatably and-displaceabl joprnalled in an appropriate bore in the lug' l5 shallow'casng 3, a gear wheel 2G4 bearing on but when freed tendine' from the outer face of leaf spring .265 secured to the inner circumference of the casing 3. llotutfibly journalled in an offset lue; 26b oli the lont' spring, is a roller 28 and on the under side of the finger hold dial l is secured a cani 28 which,.as shown, in Figure 5 is normally in contact with the roller 28 so as to force the leaf spring 26n to exert pressure on the gear wheel 26 and thereby to hold the cam 20 in its outermost position (Figs. 4 and 5) inopposition to the inward pressure exerted thereon as already stated by the contact spring 19.

The opposite face of the gear wheel 26 adjacent to the bottom of the shallowr casing 3 is provided with a circular slot 2 into which projects from its upper side a pin 2* so that. inthe position .of gear Wheel 2 6 shown in Figs. 4 and 5, and when the linger hold dial is in itsnormal position, said pin engages the end of the stop screw fitted' in the lug 15". In the position shown in Fig. 6, that is to say when cam 28 has left the roller 28 and the latter'with spring 26n have freed the gear wheel 26 the cam with shaft 27 are displaced inwardly by the pressure of tbe spring 19 and the pins 2b and 15 are.l as shown. removed one from the'other and therefore relatively out of eng'agement; when in engagement these pins a stop lock against continual rotation of the cani 2O and the-gear by which it isv operated.

The configuration of the cam -28 is such as to cause the shaft 27 and the impulse cam 2() to be forced outward against thc tension of the springr 19 as the dial 1 duringT its return rotation passesthrough the final portion of itsvmovemcnt just before reaching to rise this geur wheel 1s a normal.

Projecting axially from a late 34 (Fig. 4.) between which and the dial 1 the compound gear 14, 80 is confined, is a central shaft 32 which-extends right through and bevond thecavitjy jfornied by thc flange 15 whichaccommodates the centrifugal governor. ln the example shown this governor consistsl ns clearly seen in Fig-ure 2. of a resilicnt plato 2l.'extendingdiagrunnnatically across the cavity, and carrying at each end a circularly curved arm 21 fitted with a Weight 22 of which the sides adjacent to the inner periphery of the flange 18 are coated with rubber or other friction material. Instead of the governor 2l a spider having' threev or four radial arms, each fittedwith a weight, may of course, be used if desired.

and carrying at its inner end inside the Normally the other end of which isv This governor, ee shown, ie fitted axially but iooeely, on the shutt 32 by means of e boss 32, ie edep'ted to be driven-by a gear 233 oi? e. ratchet sind gear unit, which is ioosely mounted on the shaft 32. To this end, the governor body is provided With a pei-vl 2li engoging the ratchet teeth 25 of the unit eo that the governor is rotated by the rotation of the gear 33,- but is free to revolve end to continue ite rotation thereon zitter the geni: hes stopped thus being relieved from any euch strain es would otherwise be exerted thereon by 'e .sudden etoppege of the geur vvheoi..

vviil be eeen trom Figs. 3 end e, the

wheel in in ineeh With gear `wheel 29 iooffveiy journeiied on e Vstub shaft 29, mounted "within the housing 3.1 This gear wheel 22 ie integrel with e small concentricel pinion 291 which letter is in mesh with the geur 'wheel 30 which, :is stated, is integral with 'the mein rntchet gear wheel 14. v'The geni" Wheel 29, moreover, is also' in mesh with the geur wheel 26 which, es above reif ierred to, is .mounted on theinner end of eheit 2'( oi? the impulse generating cam 20. it will fthus be eeen that :as-.the ratchet geer Wheel 14 ierote'ted, rotetionis vimparted through the geur Wheel .to the' pinion 29h und Vtheieti'n:ough to gear wheel 29 which in tinn, drives the pinion 33 vvith the el kont 25 und the centrifuge] govero. et the seine tiindthe geel Wheel 26 :n ie ehoit 27' end the impulse generating il" nein .20. i. f

M The operetion ci" the device is as follooe:- l

lin the well hnovvn manner the user oi the device nccording to the digit required pinces his tinger in the hole oftlienger hold dini l which registers ,with that digit,

und `pulls, the dini oro'und in the directionoi' errorv until his iiinger hns vencounteredtl'ie stop 11 chown in lfigure 1 (for setting). @y so'doing, "thefcuin y.26 (Figs. 1i, 5 end v6) -fiirzniged on the underside oli the dial 1', slips oil? the roller 2W-freeing the letter Vto the up'- u'iird tendency oit the spring 26, thereb.

27 und theinipulee cern 20 to be' 'pushed inwardly from the position shovvn'in Figures "d, end 5 to that shown in 'Figure 6 by 'the reunion ol the outer ehunt spring 19` and* canning* the shunt' springe, i8' end. 19 tobe ou 6 .thun enabling the' gear-Wheel 26 to be rojteted. .iluring the clockwise rotation of the UU tingerhold die] pevvl i rides' over' the teeth ci the. retchet wheel 1li and none ofthe` gioni'. ivheelero't the'inecheuiem are therefore.

causing the geur Wheel 26,v the stub sha ty short circuited. By vthie dieplecernentotthe ,freer Wheel 26 the locking pine 2l and 15 bel come looelly eepziruted es yehoifvn in Figure tion, the user releases the dial to the action of the power spring 5 which causes it to revolve inthe opposite direction until it is pawl 7 is in engagement with the ratchet gear 14 thereby causing' this gear to rotate with the dial., and through 'the gear wheel und the geer unit 29, 29", to drive. the gear unit 33, 25 and the governor, and et the same time, thelgeur Wheel 26, shaft 27, and impulse cern 20. Both the governor 21 end the impulse cem 20 ere tlxeretore in ro tation during the Whole of the return rotution of the finger hold die] 1.

During this operation (Fig. 6) thegover-- nor exerts regulating effect on the diei by centrifugal or braking action and while the impulse cam 20 is operative in repeatedly breaking the contact between the impulse". -V

springs 16 and 17. Just at the n'ioinent when the impulse cam has performed its last ac tiverevolution and the last impulse ofthe Series has thus been transmitted and duringtheleSt stage of the return movement of the dial the cem 28Vrides'upon the roller 28, thus forcing the roller down against the geefV wheel 26, end through the spring 26' exerting direct friction and braking eiiect onl the letter. The shaft 27 and the impulse cam20, are thus forced outward again to the position shown in Figures 4 and 5 in opposition/to the tension of the shuntl spring 19 'and the friction on the gear wheel 26 above referred to prevents any overthrow of the impulse cam 2() before the letter is broughtto a, standstill by thc engagement of the stop pins 2,.15, which causes the Whole gear trein', the impulse caniand the fingerl hold dial -1 to come to u. deed 'stop coinciding precisely with the normal posivtionl of 'the dial.

Figs; 4 und 5 that in vthis normal posi-V im It willv be seen from tion,jthefimpulse springsy 16, 17 are vclosed While the shuntl springs 18, 19 'of the tele-v phone .equipment areheld open by theme'-v chanical contact of the outer f shunt spring 19 with the end of the shaft 27 of the irnpulse cam. l v v Between the time of commencing and conm pleting its operation, the impulse "cem is,

therefore, diepla'cedrelutive'l to the e Aringe 1 6, 17,12%,19 controlled by 1t und this dief placement takes place in the'exainple shown, always-at the' end of the lest ect-ive rotationv to .enable the cam to performv the required idle movement when out oi2 register :with the impulse springs 16, 17. Theection is so vtimed that this: displacement is eiected et'the'v precisel moment and-the cein"20.ie notstopped until ithescompleted its idle revolution while it is-heldiopposite the gap between the impulse springe'lti, 17' and the shuntl springe 18,119 lend' before the engagement of the pins 2b,- 15, by which both thev a pin cooperating with said obstruction,

linger hold dial 'and the cam are arrested means for rotating said gear and cam, a'

in the'position for the next setting o eradevice for moving said gear to cause the tion. Wilhen so arrested the action o' the cam to rotate in a different plane, out of o whole gear trein .is stopped, but due to the operative relation with the impulse springs ratchet arrangement'between 'the gear unit and to bring said gear into operative rela- 33 and and the governor 2l this sudden tion with said pin to prevent more than one 'stoppage is 'not transmitted to the governor,- rotation of the cam while out of operative which is thereby relieved from any unnecesrelation with the springs.

H! sary strain. 7. vIn a calling device, impulse springs, a

What il claim as my invention is: ram for operating said springs, a wear train l. in .an impulse sending device, a mount for ch-iving said cam. a E'roove 1n t .eside of ing plate having a' spring and roller device one 'of said gears, an obstruction in said attached thereto, a finger hold dial having groove, n pin cooperating with said obstruca shoulderalhmd thereto, a gear driven cani', tion to limit the movemfnt ot' the gear train, 80 a sourceot power for driving said cam and and means for moving sui-'i gear parallel to dial, to move said shoulder'over said spring its axis 'and out of operative relation with and roller device to shift said cam. from a said )in to permit the rotation of the gear. non-impulse sending position to an impulse 8. ln a calling device, impulse sending sending position, and tor returning the same mechanism, a gear train for operating said to a non-impulse sending position each time mechanism, a stationary pin cooperating the linger hold dial is operated.- y with one ofv the gears to stop the movement 2. ln an impulse sending mechanism, a thereof, and means for moving said gear out spring and rolle-r device fixed to a stationof range ot said pin topermit the operation' ery part thereof, agear driven cam, a source of the gear train. of power for operating Saiddevice to shift 9. In 21 Calling deVCG, impulso Sendill said cam 'from a non-impulse sending posimechanism, a gear train for operating sai tion to an impulse sending position. mechanism, a stationary pin cooperating 3. ln a calling device, springs, a shaft earwith one of the gears to stop the movement rying a gear .on one end andan interruptthereof, saidgear rotating in a plane out of ing device on the other end for` operating range of said pin, and means for moving thesaidsprings, said sha-ft movable endwise, a gear into range .of the pin to stop the gear rotatable ringer hold dial. a llexible bracket train. mounted on a. stationary )art of said calling l0. In a calling devi( e, impulso sending device extending overvsaic gear and carrying mechanism, a gear for operating said. mecha 100 a roller-,a shoulder on the dial engaging-said nfsm, an obstruction on one side of the gear,

roller. a sourceof power for moving said a pin in the path of .said obstruction for shoulder lto thereby move said gear und preventing rotation thereof, and means for shaft throughthe medium of said bracket moving thegear parallel to its axis to permit "m and roller while the dial is rotating. its rotation.

4. ln a calling device, a. shaft lhaving -a l-l. In an impulse sending devicznan imcamon one endend gear on the other end, v pulse generating cam, said-cam movable into mechanisln for rotating saidwshaft, means and out of its impulse generating position, a associated withisaid gear causing it to rotate gear for driving said cam, a mounting plate in diiierent planes, and means for limiting forsupporting said gear, a spring mounted the rotary movement'to a single revolution on said plate carrying a roller, a finger hold in one plane, said means being directly asdial for operating said gear, and moans on sociated with said gear. the dial'for .moving said cam through the in a calling device, a. source of power, medium of said roller.

50 a gear, a groove in said gear'rnnning concen- 12.. In acalling device, an impulse sending 115 l tric'to the periphery thereof, an obstruction mechanism comprising impulse springs, a

in said groove, apin adapted to engage said cam for operating said springs movable into' obstruction, and means for inovinfr said gear and out of operative relation therewith, a

r out 'of normal range of said pin during one rotatable gear for driving said cam, a groove 'm period of operation to allow said gear` to in said gear having an obstruction therein, 120 rotate a plurality of revolutions, and for means for moving said gear parallel to its thereafter returning saidgear into range of axis to vbrin n the vcam outof operative relasaid pin and-allowing the obstruction of said tion with t e springs, and a )in 'for' engroove to engage with saidpin only after gaging the obstruction in sai(l groove to said gear hascompleted a revolution in its limit. Vthe rotation of the cam while out of normal range. .p engagement with the springs.

G. n .a calling device, impulse springs, 13. In an impulse sendirg device, a mounta cam' for interrupting said springs, a gear ing plateJ supporting a finger hold dial and a for driving said cam, a groove in one side gear driven cam having an impulse sending of said gear having an obstruction. therein, and a non-impulse sending position, a source '130 .of povr for driving smdoam and dial, a

sprmg andy roller duim-,mounted on 'said plate, and mshouldewon Said dial :for oner-v ating said sprnga'nd roller device to s ift said cam yfrom 'un im mlse sendingposition `to. :1 n0n-11rlpu1se `sen mg posltlon.

14. Il x nvcall'ing dence. impulso sending mechamsma gear for operntmg' sa-lf mecha `msm, im obstruct-ion on one, side of the' gear,

venting rotutionfhereo. :mii manna inc 11dapio` infthepath o'said obstruction "forv re! o,

ing-4,l spring for moving lthe @arp-granel its axis to permit its rotation.

'In wltness whereof, 1 hereunto sulosr'iibge` "a 1 myffname .this 16th day'iof August, A. 1921*, -f r 

